My first game was DOOM. I don't remember it too well since I was just a kid back then. But what I do remember is that I was actually too scared to take even a few steps ahead of the starting position of the first level.
My first game was probably something my dad played when i was little and i joined in once in a while, or half life which I started playing at like age seven.
The first online game I ever played was Guild Wars.
I used to play a ton back in the day. Then I found World of Warcraft and it consumed my life for a good 3 years during high school. Haha.